Touch panel and display device with touch panel

ABSTRACT

An electrostatic capacitive coupling type touch panel including an input region having four sides, a peripheral region around the input region, terminals formed in the peripheral region along a first side of the input region, wirings formed in the peripheral region along second, third and fourth sides of the input region, and the input region having X and Y electrodes crossing. The wirings are connected between corresponding X or Y electrodes and wiring terminals plurality of terminals. A dummy wiring, which is not connected to any of the X electrodes or Y electrodes, is provided outside the wiring formed in a farthest position from the input region, and the dummy wiring extends through the peripheral region along the second, third and fourth sides of the input region, and electrically connects to at least one dummy wiring terminal.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No. 16/453,089, filed Jun. 26, 2019, which, in turn, is a continuation of U.S. application Ser. No. 16/284,088, filed Feb. 25, 2019 (now U.S. Pat. No. 10,379,690), which, in turn, is a continuation of U.S. application Ser. No. 16/181,471 (now U.S. Pat. No. 10,261,647), filed Nov. 6, 2018, which, in turn, is a continuation of U.S. application Ser. No. 16/024,952 (now U.S. Pat. No. 10,152,189), filed Jul. 2, 2018, which, in turn, is a continuation of U.S. application Ser. No. 15/717,342 (now U.S. Pat. No. 10,042,500), filed Sep. 27, 2017, which, in turn, is a continuation of U.S. application Ser. No. 15/070,198 (now U.S. Pat. No. 9,804,723), filed Mar. 15, 2016, which, in turn, is a continuation of U.S. application Ser. No. 14/206,388 (now U.S. Pat. No. 9,323,294), filed Mar. 12, 2014, which, in turn, is a continuation of U.S. application Ser. No. 12/954,976 (now U.S. Pat. No. 8,681,121), filed Nov. 29, 2010, the entire contents of which are incorporated herein by reference.

CLAIM OF PRIORITY

The present application claims priority from Japanese Patent Application JP 2009-273054 filed on Dec. 1, 2009, the content of which is hereby incorporated by reference into this application.

BACKGROUND OF THE INVENTION

The present invention relates to a touch panel and a display device with a touch panel, and more particularly, to a technique preferably applicable to wiring formed outside an input region.

DESCRIPTION OF RELATED ART

In recent years, for propagation of mobile devices, a touch panel technique to support a “user friendly” graphical user interface has become more important.

As this touch panel technique, an electrostatic capacitive coupling type touch panel is known. As this electrostatic capacitive coupling type touch panel, a touch panel, where a touch position in which an observer's finger has touched is detected, is disclosed in JPA 2008-310550.

In this specification, an electrostatic capacitive coupling type touch panel is also called as an electrostatic capacitance type touch panel. They are also may be called a capacitive sensor. A touch panel may be called a touch sensor.

In the touch panel disclosed in JPA 2008-310550, a coupling capacitance between an electrode in an X direction and an electrode in a Y direction is detected so as to detect coordinates of a position where an observer has touched.

FIG. 7 is a plane view for explanation of the conventional electrostatic capacitive coupling type touch panel.

As shown in FIG. 7, the conventional electrostatic capacitive coupling type touch panel has plural X electrodes 1 and plural Y electrodes 2 crossing the X electrodes 1.

The plural X electrodes 1 respectively have an electrode pattern where a first part 1 a and a second part 1 b having a width greater than that of the first part 1 a are alternately arranged. The plural Y electrodes 2 respectively have an electrode pattern where a first part 2 a and a second part 2 b having a width greater than that of the first part 2 a are alternately arranged.

A region where the plural X electrodes 1 and the plural Y electrodes 2 are formed is an input region ERI. In a peripheral region provided around the input region ERI, plural wiring layers ML connected to the plural X electrodes 1 and the plural Y electrodes 2 are provided.

Note that as shown in FIG. 8, the wiring layer ML has a transparent conductive layer (ITO; Indium Tin Oxide) 10 as a lower layer and a metal layer 11 of silver alloy material or the like. Note that FIG. 8 is an enlarged view of a corner of the wiring layer ML show in FIG. 7.

The above-described wiring layer ML is formed in a process as shown in FIGS. 9A to 9D.

-   (1) A transparent conductive film F10 as a transparent conductive     layer is formed on the entire surface of a substrate (e.g., a     transparent substrate such as a glass substrate) 21 (FIG. 9A). -   (2) Next, a metal film as the metal layer 11 is formed on the     above-described transparent conductive film F10, and the metal layer     11 as an upper layer of the wiring layer ML is formed with a series     of photolithographic technique (FIG. 9B). -   (3) Next, a resist film is formed on the metal layer 11 using e.g.     positive resist, then irradiated with light (e.g., ultraviolet     light) using a transparent conductive layer formation photomask MSK,     then the resist film is selectively developed, thereby a resist film     RF is left only on the metal layer 11 (FIG. 9C). -   (4) Next, the transparent conductive film F10 is etched by wet     etching, thereby the resist film RF is removed, thus the transparent     conductive film F10 is formed (FIG. 9D).

Note that generally, as shown in FIG. 10, in the transparent conductive layer formation photomask MSK, a mask pattern MPA for forming the transparent conductive layer 10 is formed, with a chrome (Cr) film, on a light (e.g. ultraviolet light) transmitting substrate MSB.

As the surface of the transparent conductive layer formation photomask MSK is contaminated by chemical reaction or the like of the resist film RF upon light irradiation, it is necessary to clean the transparent conductive layer formation photomask MSK.

However, the chrome film mask pattern MPA of the transparent conductive layer formation photomask MSK is deteriorated by the cleaning. Especially, the deterioration of the chrome film mask pattern MPA is serious at a corner of the wiring layer ML formed in a position farthest from the input region ERI.

Accordingly, it is conceivable that as shown in FIGS. 11A and 11B, the pattern of the resist film RF becomes thin due to the deterioration of the chrome film mask pattern MPA of the transparent conductive layer formation photomask MSK, then the corners become rounded, and a part of the metal layer 11 is protruded from the resist film RF. Note that FIGS. 11A and 11B are cross-sectional views showing the resist film RF, formed on the metal layer 11 using the transparent conductive layer formation photomask MSK in which the chrome film mask pattern MPA is deteriorated.

In the state shown in FIGS. 11A and 11B, when wet etching is performed so as to form the transparent conductive layer 10, the etchant erodes and etches the metal layer 11 as shown in FIG. 12, accordingly, the wiring layer ML becomes chipped or wire-broken.

SUMMARY OF THE INVENTION

The present invention has been made so as to address the above-described problem of the conventional technique, and provides a technique in a touch panel to prolong a period before wiring formed outside an input region is chipped or wire-broken due to deterioration of a mask pattern.

Among aspects of the present invention disclosed in the present application, the outline of typical aspect is as follows.

According to an aspect of the present invention, provided is an electrostatic capacitive coupling type touch panel having: an input region; and a plurality of wirings formed around the input region, the input region having a plurality of X electrodes and a plurality of Y electrodes crossing the X electrodes, the plurality of wirings respectively being connected to corresponding electrodes of the plurality of X electrodes and the plurality of Y electrodes, wherein the plurality of wirings respectively have: a conductive layer; and a metal layer formed on the conductive layer, wherein the conductive layer is formed to have a width greater than that of the metal layer, wherein the plurality of wirings have a corner, and wherein, in a wiring provided in a farthest position from the input region, among the plurality of wirings, the corner of the metal layer is chamfered.

In the touch panel, assuming that a width of a chamfered portion of the metal layer at the corner of the wiring formed in the farthest position from the input region is W1 and a mean value of the widths of the metal layers in linear portions of the wiring formed in the farthest position from the input region is W2, 0.8×W2≤W1≤1.2×W2 is satisfied.

Further, according to another aspect of the present invention, provided is an electrostatic capacitive coupling type touch panel having: an input region; and a plurality of wirings formed around the input region, the input region having a plurality of X electrodes and a plurality of Y electrodes crossing the X electrodes, the plural wirings respectively being connected to corresponding electrodes of the plurality of X electrodes and the plurality of Y electrodes, wherein the plurality of wirings respectively have: a conductive layer; and a metal layer formed on the conductive layer, wherein the conductive layer is formed to have a width greater than that of the metal layer, and wherein a dummy wiring, not connected to any of the plurality of X electrodes or the plurality of Y electrodes, is provided outside the wiring formed in a farthest position from the input region, among the plurality of wirings.

In the touch panel, the dummy wiring is supplied with a reference voltage.

In any one of the above-described touch panels, the conductive layer has a transparent conductive film.

In any one of the touch panel, the plurality of wirings respectively have an upper conductive layer provided on the metal layer with an insulating film therebetween, and the upper conductive layer is electrically connected to the conductive layer of the plurality of wirings.

In the above-described touch panel, the conductive layer and the upper conductive layer have a transparent conductive film.

In any one of the above-described touch panels, the X electrode and the Y electrode have a transparent conductive film.

In any one of the above-described touch panels, the X electrode and the Y electrode are formed with an insulating film therebetween.

In any one of the above-described touch panels, the X electrode and the Y electrode have an intersection part between the X electrode and the Y electrode and an electrode part formed between two intersection parts, the electrode part and the intersection part of the X electrode and the electrode part of the Y electrode are formed on the same layer, and the intersection part of the Y electrode is formed on a different layer, with an insulating layer therebetween.

Further, according to another aspect of the present invention, provided is a display device with touch panel wherein any one of the electrostatic capacitive coupling type touch panel is provided on a surface of a display panel on the observer side.

Among aspects of the present invention disclosed in the present application, the effects of typical aspect are as follows.

In accordance with the touch panel according to the present invention, it is possible to prolong a period before wiring formed on the outside of an input region is chipped or wire-broken due to deterioration of a mask pattern.

Other features and advantages of the present invention will be apparent from the following description taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plane view showing an electrode pattern of an electrostatic capacitance type touch panel as a presupposed element of the present invention;

FIG. 2 is a cross-sectional view showing a structure along a line A-A′ in FIG. 1;

FIG. 3 is a cross-sectional view showing a structure along a line B-B′ in FIG. 1;

FIG. 4 is an enlarged view of a corner of a wiring layer provided in a farthest position from an input region among plural wiring layers provided in a peripheral region of the electrostatic capacitance type touch panel in an embodiment of the present invention;

FIG. 5 is a schematic view of an arrangement of wiring layers ML provided in the peripheral region of the electrostatic capacitance type touch a panel in the embodiment of the present invention;

FIG. 6 is a schematic view of a display device with touch panel using the electrostatic capacitance type touch panel in the respective embodiments of the present invention;

FIG. 7 is a plane view for explanation of a conventional electrostatic capacitive coupling type touch panel;

FIG. 8 is an enlarged view of a corner of the wiring layer ML in FIG. 7;

FIGS. 9A to 9D are cross-sectional views for explanation of a manufacturing method of the wiring layer in FIG. 7;

FIG. 10 is a cross-sectional view for explanation of a transparent conductive layer formation photomask;

FIGS. 11A and 11B are cross-sectional views showing the resist film RF, formed on the metal layer 11 using the transparent conductive layer formation photomask in which a chrome film mask pattern is deteriorated; and

FIG. 12 is a cross-sectional view showing the wiring layer after etching in the state shown in FIG. 11.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinbelow, embodiments of the present invention will be described in detail in accordance with the accompanying drawings.

Note that in all the figures for explanation of the embodiments, elements having the same function will have the same reference numerals and repeated explanations thereof will be omitted.

[Structure of Touch Panel as Presupposed Element of Present Invention]

FIG. 1 is a plane view showing an electrode pattern of an electrostatic capacitance type touch panel as a presupposed element of the present invention.

FIG. 2 is a cross-sectional view showing a structure along a line A-A′ in FIG. 1.

FIG. 3 is a cross-sectional view showing a structure along a line B-B′ in FIG. 1.

An electrostatic capacitance type touch panel 20, as a presupposed element of the present invention, has plural X electrodes 1, extended in a first is direction (e.g. in an X direction) and provided in parallel at a predetermined array pitch in a second direction (e.g. a Y direction) crossing the first direction, and plural Y electrodes 2 extended in the second direction crossing the plural X electrodes 1 and provided in parallel at a predetermined array pitch in the first direction, on the surface of a substrate 21 on the observer side.

The plural Y electrodes 2 respectively have an electrode pattern where a first part 2 a and a second part 2 b having a width greater than that of the first part 2 a are alternately arranged in the second direction. The plural Y electrodes 2 are provided on the surface of the substrate 21 on the observer side. As the substrate 21, a transparent insulating substrate such as a glass substrate is used.

The plural X electrodes 1 respectively have an electrode pattern where a first part 1 a and a second part 1 b having a width greater than that of the first part 1 a are alternately arranged in the first direction. The first parts 1 a of the plural X electrodes 1 are provided on an insulating film 12 formed on the surface of the substrate 21 on the observer side.

The second parts 1 b of the plural X electrodes 1 are formed separately from the Y electrodes 2 on the surface of the substrate 21 on the observer side. Note that the first parts 1 a of the plural X electrodes 1 are covered with a protective film 13 formed as an upper layer.

The first part 1 a of the X electrode 1 two-dimensionally crosses the first part 2 a of the Y electrode 2, and electrically connected to two adjacent second parts 1 b with the first part 2 a therebetween via a contact hole 12 a formed in an insulating film 12 as an interlayer insulating film between the first part 1 a of the X electrode 1 and the Y electrode 2.

In a plan view, the second part 2 b of the Y electrode 2 is provided between the respective first parts 1 a of two adjacent X electrodes 1. Also in a plan view, the second part 1 b of the X electrode 1 is provided between the respective first parts 2 a of two adjacent Y electrodes 2. That is, the Y electrode 2 has a portion wider than the width of a portion crossing the X electrode 1 between the X electrodes 1, and the X electrode 1 has a portion wider than the width of a portion crossing the Y electrode 2 between the Y electrodes 2.

A region where the plural Y electrodes 2 and X electrodes 1 are provided is an input region ERI, As shown in FIG. 1, plural wiring layers ML electrically connected to the respective plural Y electrodes 2 and the respective plural X electrodes 1 are provided around the input region ERI. The plural wiring layers ML electrically connect the plural Y electrodes 2 and the plural X electrodes 1 to drive circuits.

As shown in FIGS. 2 and 3, the plural wiring layers ML are provided on the surface (main surface) of the substrate 21 on the observer side, and covered with an insulating film 12 formed as an upper layer. The plural wiring layers ML are electrically connected to corresponding electrodes (the X electrodes 1 and the Y electrodes 2) at ends of the respective electrodes (the X electrodes 1 and the Y electrodes 2).

The plural X electrodes 1 and the plural Y electrodes 2 are formed with transparent conductive material or the like having high transparency such as ITO (Indium Tin Oxide). Further, the wiring layer ML has a transparent conductive layer 10 formed of transparent conductive material such as ITO as a lower layer and a metal layer 11 formed of e.g. silver alloy as an upper layer.

Further, each of the plural wiring layers ML is formed on the metal layer 11 with the insulating film 12 therebetween, and has an upper transparent conductive layer 10U of transparent conductive material such as ITO. The upper transparent conductive layers 10U are electrically connected to the respective transparent conductive layers 10 of the plural wiring layers ML via contact holes 12 b formed in the insulating film 12 near the terminals of the wiring layer ML.

The touch panel 20 in the present embodiment receives a signal outputted from the drive circuit via a wiring on a flexible printed circuit board connected to one side of the touch panel 20.

Note that through holes are formed in the wirings on the flexible printed circuit board, and the wiring is electrically connected to crossing wiring on the rear side via the through hole. The crossing wirings cross a large number of wirings, and again connected to the wirings via through holes formed at the other end. In the present embodiment with this arrangement, the respective plural X electrodes 1 and plural Y electrodes 2 are supplied with driving voltages outputted from the drive circuits from both sides.

Next, the method of manufacturing the electrostatic capacitance type touch penal 20 as a presupposed element of the present invention will be described with reference to FIGS. 1 to 3.

-   (1) First, a first transparent conductive film as a transparent     conductive layer is formed on the entire surface of the substrate     (e.g. a transparent substrate such as a glass substrate) 21 on the     observer side (see above-described FIG. 9A). -   (2) Next, a metal film as the metal layer 11 is formed on the     above-described first transparent conductive film, and the metal     layer 11 as an upper layer of the wiring layer ML is formed by the     photolithographic technique (see above-described FIG. 9B). -   (3) Next, a first mask having an electrode pattern and wiring layer     conductive film pattern is formed using e.g. positive resist on the     metal layer 11. Then the first transparent conductive film is etched     using the above-described first mask as an etching mask, thereby the     plural Y electrodes 2, the second parts 1 b of the plural X     electrodes 1, and the transparent conductive layer 10 as a lower     layer of the wiring layer ML are formed (see above-described FIGS.     9C and 9D). In this process, respective ends of the X electrodes 1     and the Y electrodes 2 are electrically connected to corresponding     wiring layers ML. -   (4) Next, the above-described first mask is removed, then, the     insulating film 12 of e.g. negative resist is formed on the     substrate 21 including the plural Y electrodes 2, the second parts 1     b of the plural X electrodes 1 and the wiring layers ML. In this     process, the plural Y electrodes 2, the second parts 1 b of the     plural X electrodes 1 and the wiring layers ML are covered with the     insulating film 12. -   (5) Next, the contact holes 12 a and 12 b are formed in necessary     positions of the insulating film 12, then, a second transparent     conductive film as a transparent conductive layer is formed on the     entire surface of the insulating film 12 including the contact holes     12 a and 12 b. -   (6) Next, a second mask having a pattern of the first parts 1 a of     the plural X electrodes 1 and the wiring layers LM is formed using     e.g. positive resist on the transparent conductive film, then, the     above-described second transparent conductive film is etched using     the above-described second mask as an etching mask, thereby the     first parts 1 a of the plural X electrodes 1 a and the upper     transparent conductive layers 10U of the wiring layers ML are formed     on the insulating film 12, In this process, the first parts 1 a of     the upper-layer plural X electrodes 1 are electrically connected to     the second parts 1 b of the lower-layer X electrodes 1 via the     contact holes 12 a. Further, the upper transparent conductive layers     10U of the respective wiring layers ML are electrically connected to     the transparent conductive layers 10 of the respective wiring layers     ML via the contact holes 12 b. -   (7) Next, the above-described second mask is removed, then the     protective film 13 of e.g. negative resist is formed on the     insulating film 12 including the first parts 1 a of the plural X     electrodes 1 and the upper transparent conductive layers 10U,     thereby the structure shown in FIGS. 1 to 3 is obtained. In this     process, the first parts 1 a of the X electrodes 1 and the upper     transparent conductive layers 10U are covered with the protective     film 13.

Note that in the above explanation, it may be arranged such that the X electrodes 1 and the Y electrodes 2 are formed on different layers. For example, the Y electrodes 2 may be formed on the insulating film 12. In this case, it is necessary to electrically connect the Y electrodes 2 to the wiring layers ML via the contact holes formed in the insulating film 12.

Embodiment 1

FIG. 4 is an enlarged view of a corner of the wiring layer ML provided in a farthest position from the input region ERI among plural wiring layers ML provided in the peripheral region of the electrostatic capacitance type touch panel 20 in an embodiment 1 of the present invention.

As shown in FIG. 4, as the feature of the present embodiment, the pattern of a mask for formation of the metal layer 11 as an upper layer of the wiring layer ML is changed and the metal layer 11 is chamfered at corners of the wiring layer ML. Assuming that the minimum width (the width of a narrowest portion) of the chamfered portion of the metal layer 11 at a corner of the wiring layer ML is W1, and a mean value of widths of the metal layer 11 in linear portions of the wiring layer ML formed in the farthest position from the input region is W2, 0.8×W2≤W1≤1.2×W2 is satisfied.

In this arrangement, in the present embodiment, as shown in FIGS. 11A and 11B, even when the pattern of a resist film RF is thinned and the corners are rounded due to deterioration of a mask pattern MPA of a transparent conductive layer formation photomask MSK, a period before a part of the metal layer 11 is protruded from the resist film RF can be prolonged. That is, in the present embodiment, the tolerance to the protrusion of the metal layer 11 as an upper layer of the wiring layer ML from the resist film RF can be improved.

Accordingly, in the present embodiment, since a period before the wiring layer ML is chipped or wire-broken due to deterioration of the mask pattern MPA of the transparent conductive layer formation photomask MSK can be prolonged, the tolerance to wire-breakage of the wiring layer ML due to deterioration of the mask pattern MPA of the transparent conductive layer formation photomask MSK can be improved.

Embodiment 2

FIG. 5 is a schematic view of an arrangement of the wiring layers ML provided in the peripheral region of the electrostatic capacitance type touch panel 20 in an embodiment 2 of the present invention.

As shown in FIG. 5, as the feature of the present embodiment, a dummy wiring layer MLD is formed outside the wiring layer ML provided in the farthest position from the input region ERI among the plural wiring layers ML. In the present embodiment, as in the case of the respective wiring layers ML, the dummy wiring layer MLD, having the transparent conductive layer 10 as a lower layer, the metal layer 11 as an upper layer and the upper transparent conductive layer 10U, is provided at the same interval as that of the respective wiring layers ML. Further, the dummy wiring layer MLD is not electrically connected to any of the plural Y electrodes 2 or the plural X electrodes 1.

Generally, the mask pattern MPA of the transparent conductive layer formation photomask MSK is deteriorated in the cleaning process for the transparent conductive layer formation photomask MSK. The deterioration of the transparent conductive layer formation mask pattern MPA of the outermost wiring layer ML is extremely serious, while the deterioration of the transparent conductive layer formation mask pattern MPA in an inner position is extremely slight.

Accordingly, in the present embodiment, since a period before the pattern of the resist film RF is thinned and the corners are rounded due to the deterioration of the mask pattern MPA of the transparent conductive layer formation photomask MSK can be prolonged, the period before a part of the metal layer 11 is protruded from the resist film RF can be prolonged. Accordingly, in the present embodiment, since the period before the wiring layer ML is chipped or wire-broken due to the deterioration of the mask pattern MPA of the transparent conductive layer formation photomask MSK can be prolonged, the tolerance to breakage of the wiring layer ML due to the deterioration of the mask pattern MPA of the transparent conductive layer formation photomask MSK can be improved. Note that in the present embodiment, it may be arranged such that a ground potential or the like is supplied to the dummy wiring layer MLD.

FIG. 6 is a schematic view of a display device with touch panel using the electrostatic capacitance type touch panel in the above-described embodiments.

The display device with touch panel shown in FIG. 6 has a liquid crystal display panel 30, the electrostatic capacitance type touch panel 20 in the above-described embodiments, provided on the surface of the liquid crystal display panel 30 on the observer side, and a backlight 40 provided under the surface of the liquid crystal display panel 30 on the side opposite to the observer side. As the liquid crystal display panel 30, an IPS type liquid crystal display panel, a TN type liquid crystal display panel, a VA type liquid crystal display panel or the like is used. The liquid crystal display panel 30 has a display region where plural pixels are provided in a matrix array and a non-display region provided around the display region.

Further, in FIG. 6, the display device with touch panel in which the touch panel is provided on the liquid crystal display panel is described as an example of the display panel. However, the present invention is not limited to this arrangement. The present invention is also applicable to a display device is with touch panel in which the touch panel is provided on another display panel such as an organic EL display panel or an inorganic EL display panel.

The present invention made by the inventors has been specifically described based on the above-describe embodiments. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the scope of the present invention. 

What is claimed is:
 1. A touch panel comprising: a substrate; a touch detection region including a plurality of electrodes; a peripheral region located around the touch detection region; a plurality of terminals including a first terminal and a second terminal and located between the touch detection region and an edge of the substrate; a first wiring with a first bending portion on the substrate and connecting to the first terminal; and a second wiring with a second bending portion on the substrate and connecting to the second terminal, wherein the second bending portion is between the touch detection region and the first bending portion and is closer to a center portion of the substrate than the first bending portion is, a shape of the first bending portion is different from a shape of the second bending portion, the first bending portion is located along a corner of the touch detection region, the first bending portion has a first inner part which bends and a first outer part which bends, and an angle of the first inner part is smaller than an angle of the first outer part in a planar view.
 2. The touch panel according to claim 1, wherein the first outer part has two bending points.
 3. The touch panel according to claim 2, wherein the first inner part has only one bending point.
 4. The touch panel according to claim 1, wherein the first outer part includes a chamfered portion.
 5. The touch panel according to claim 1, wherein the first wiring has a straight portion, and a width of the first bending portion is smaller than a width of the straight portion.
 6. The touch panel according to claim 1, wherein the second bending portion has a second inner part which bends and a second outer part which bends, and a shape of the first outer part is different from a shape of the second outer part.
 7. The touch panel according to claim 6, wherein a shape of the second inner part is the same as the shape of the second outer part.
 8. The touch panel according to claim 1, wherein the electrodes include a first electrode and a second electrode, the first wiring connects to the first electrode, and the second wiring connects to the second electrode.
 9. The touch panel according to claim 1, wherein the first wiring does not connect to the electrodes, and the second wiring connects to one of the electrodes.
 10. The touch panel according to claim 9, wherein a ground potential is supplied to the first wiring.
 11. The touch panel according to claim 1, further comprising a plurality of wirings including the first and second wirings, wherein the first wiring is an outer most wiring among the wirings.
 12. The touch panel according to claim 1, further comprising a plurality of wirings including the first and second wirings, wherein the wirings have bending portions, and the first bending portion is an outer most bending portion among the bending portions.
 13. A touch panel comprising: a substrate; a touch detection region including a plurality of electrodes, a peripheral region located around the touch detection region, wirings located in the peripheral region and including a first wiring with a first bending portion and a second wiring with a second bending portion, wherein the first wiring overlaps with the second wiring in a plan view, the first wiring and the second wiring are an outer most wiring among the wirings, the first bending portion is located along a corner of the touch detection region and has a first inner part which bends and a first outer part which bends, the second bending portion is located along a corner of the touch detection region and has a second inner part which bends and a second outer part which bends, the first inner part and the first outer part are located between the second inner part and the second outer part, a shape of the first inner part is different from a shape of the first outer part, and the shape of the first outer part is different from a shape of the second outer part.
 14. The touch panel according to claim 13, wherein a shape of the second inner part is the same as the shape of the second outer part.
 15. The touch panel according to claim 13, wherein the first outer part has two bending points, and the first inner part has only one bending point.
 16. The touch panel according to claim 13, wherein the first outer part includes a chamfered portion.
 17. A touch panel comprising: a substrate; a touch detection region including a plurality of electrodes, a peripheral region located around the touch detection region, terminals located in the peripheral region, and wirings located in the peripheral region and including a first wiring with a first bending portion and a second wiring with a second bending, wherein the first wiring is closest to an edge of the substrate among the wirings, both ends of the first wiring are connected to a pair of terminals among the terminals and that a ground potential is supplied, the first bending portion is located along a corner of the touch detection region, a shape of the first bending portion is different from a shape of the second bending portion, the first bending portion has a first inner part which bends and a first outer part which bends, and an angle of the first inner part is steeper than an angle of the first outer part in a planar view.
 18. The touch panel according to claim 17, wherein the first outer part has two bending points, and the first inner part has only one bending point.
 19. The touch panel according to claim 17, wherein the first outer part includes a chamfered portion. 